I found a couple of notes elsewhere - I don't pretend to understand the issue:

First one just thought too many connections left open at once.

Second one is much more specific:

Hi guys after a lot of tries I was able to solve the problem. For the note if you are using EF code first approach and you want access to your data using wcf you should consider not enabling lazy loading using the "virtual" keyword in your poco class because WCF serialize cannot serialize dynamic proxies data.

Copyright 1998-2015 Ziff Davis, LLC (Toolbox.com). All rights reserved. All product names are trademarks of their respective companies. Toolbox.com is not
affiliated with or endorsed by any company listed at this site.